After powering up his PC, Bob notices the PC was not able to properly connect to network devices. He obtained the following information from his workstation:
C:\>ipconfig
Windows IP Configuration
Ethernet adapter El90x1:
Connection-specific DNS Suffix....:
IP Address. . . . . . . . ..................: 169.254.55.187
Subnet Mask . . . . . . ................. : 255.255.0.0
Default Gateway . . . ................. :
He called the IT department for help (he was on hold for 5 minutes). When the IT tech support person got on the phone, Bob's PC had already begun working properly. Bob then obtained the following information from his workstation.
C:\>ipconfig
Connection-specific DNS Suffix....:
IP Address. . . . . . . . ..................: 139.100.110.50
Subnet Mask . . . . . . ................. : 255.255.0.0
Default Gateway . . . ................. : 139.100.110.1
a. Explain in detail what occurred.
b. How can Bob account for the first IP stack entries?
c. How would you explain the changes to the IP stack?